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8. Fault summary
Warning
Before starting to rectify faults, it is vital that
the pump is taken out of operation, and it must
be removed from the mains at all poles and
safeguarded from being switched on again.
This should only be carried out by specialist staff.
Accessible voltage!
Risk of scalding from escaping medium
Risk of burning from hot surfaces
Fault Cause Rectification
Biral impeller not lighting up No power supply Check mains switch
and fuses
Check mains plug
and cable
Biral impeller turning on red Sensor fault (*) Plug in sensor cab correctly:
(warning, pump turning) See para. 4.3
Replace sensor:
See para. 10
Biral impeller flashing red Communication fault (*) Replace frequency
(alarm, pump not turning) Internal fault (*)
Forced discharge (*) Check non-return valve:
Defective valve? Correct position?
Over-voltage (*) Check power supply
Under-voltage (*)
Dry running (*) Fill system and change pump
if necessary
Pump blocked (*) Dismantle pump,
Remove foreign bodies
Change pump, if required
Pump making noises Air in the system Ventilate system several times
with the pump turned off
Cavitation Increase system pressure/
(insufficient input pressure) Reduce temperature,
See para. 11
Pump too strong Set smaller control char. curve
See para. 7.2
Switch on power limit
Further limit flow volume
With power limit (*)
Radiators not heating up Pump too weak Set larger control char. Curve
See para. 7.2
Install stronger pumps
(*): Cause of fault according to Biral Remote
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